The B Diminished Arpeggio contains the following notes:

B – D – F

It is essentially an B minor chord, with a flat 5.

Open Position

Here’s how to play the B diminished arpeggio in the open position.

Diminished-Arpeggio-Frets-Key-B-Pos-Open-Shape-0
Diminished-Arpeggio-Notes-Key-B-Pos-Open-Shape-0

B Diminished Arpeggio CAGED Positions

Here are the 5 CAGED positions for the B diminished arpeggio on the guitar (notes and tabs).

1st Position (lowest fret is 1):

Diminished-Arpeggio-Frets-Key-B-Pos-1-Shape-4
Diminished-Arpeggio-Notes-Key-B-Pos-1-Shape-4

4th Position (lowest fret is 4):

Diminished-Arpeggio-Frets-Key-B-Pos-4-Shape-5
Diminished-Arpeggio-Notes-Key-B-Pos-4-Shape-5

7th Position (lowest fret is 7):

Diminished-Arpeggio-Frets-Key-B-Pos-7-Shape-1
Diminished-Arpeggio-Notes-Key-B-Pos-7-Shape-1

9th Position (lowest fret is 9):

Diminished-Arpeggio-Frets-Key-B-Pos-9-Shape-2
Diminished-Arpeggio-Notes-Key-B-Pos-9-Shape-2

12th Position (lowest fret is 12):

Diminished-Arpeggio-Frets-Key-B-Pos-12-Shape-3
Diminished-Arpeggio-Notes-Key-B-Pos-12-Shape-3

Further Reading:

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